Shawn Mendes, left, with James Corden on "Carpool Karaoke." (Source:YouTube Still via CBS)

How much would you pay for Justin Bieber's used underwear?

Singer Shawn Mendes, who released his new self-titled album last week, is the latest celeb to sit shotgun to James Corden for the late night show host's popular "Carpool Karaoke" segment, revealing he'd drop some serious dough for the Biebs' used undergarments.

Mendes, 19, told Corden that Bieber wears a new pair of underwear every day. That may come to no surprise to Bieber superfans - the singer said as much when he participated in "Carpool Karaoke" with Corden back in 2015. But Mendes said he'd pay $500 for a pair of Bieber's used underwear (probably Calvins).

Unfortunately, the "Lost in Japan" singer said he wouldn't pay anything for Corden's used undies.

"I'd pay not to have a pair of your underpants," Mendes told the late-night host.

Elsewhere in the episode, Mendes sang along to a few of his hits like "Mercy" and "In My Blood." He also talked about road rage, admitting he doesn't even honk and much more.